. The wonder of life. Biology; Natural history; Zoology. THE,WEB OF LIFE 295 partner an effective protection against the appetite of cuttlefishes. It is a fine case of diamond cut diamond, the thrust and parry between crab and cuttle. A number of animals which clean up others without utiliz- ing any Hving material should be ranked with the commensals, not with the parasites. This is true of many of the so-called fiish-lice (ArguUdae), which are scavengers of the skin of carp and other fishes, and of various insects and mites ( Trichodectes, Philopterus), which do the same for mammals and b
. The wonder of life. Biology; Natural history; Zoology. THE,WEB OF LIFE 295 partner an effective protection against the appetite of cuttlefishes. It is a fine case of diamond cut diamond, the thrust and parry between crab and cuttle. A number of animals which clean up others without utiliz- ing any Hving material should be ranked with the commensals, not with the parasites. This is true of many of the so-called fiish-lice (ArguUdae), which are scavengers of the skin of carp and other fishes, and of various insects and mites ( Trichodectes, Philopterus), which do the same for mammals and birds. Another example is the plover, which Herodotus accurately described as cleaning the mouth of the crocodile, removirig leeches and other parasites from the huge gape. Symbiosis.—It seems to us justi- fiable and useful to restrict this term to the mutually beneficial internal partnership of two organisms of differ- ent kinds. In most Radiolarians—pelagic Pro- tozoa usually with siliceous skeletons —^there are symbiotic Algee which used to be known as ' yellow cells'. They are imicellular plants embedded in the transparent hving matter of the Radiolarians, and a very profitable partnership has been established. Being possessed of chlorophyll, the Algee can utilize the carbonic acid formed. ElG. 49.—A colonial Eadiolarian, Col- lozoum inerme. (After Brandt.) The small spheres are the units composing the colony ; each is accompanied by partner Algae; all are imbedded in a transparent matrix. Greatly Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Thompson, John Arthur, Sir, 1861-1933. London, A. Melrose, Ltd
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Keywords: ., bookcentury1900, booksubjectnaturalhistory, booksubjectzoology
